The EPC-9 complete upper receiver is equipped with the ATLAS R-ONE handguard engineered to prioritize compactness and lightweight characteristics. Despite its streamlined design, the R-ONE handguard offers ample space for various attachments, catering to diverse user requirements. The proprietary ATLAS attachment system delivers a robust and reliable mounting platform, ensuring a slender profile without compromising the strength and stability that Aero Precision handguards are renowned for.

Upper receiver with last round bolt hold open mechanism
The upper receiver is designed to be compatible with the majority of AR-15 barrel nuts and handguards
Incorporate a dimple above the threads to ensure accurate timing of the handguard on the upper receiver
Upper receiver with standard AR-15 takedown/pivot pin lug configuration
The upper receiver is precision-engineered from custom-forged 7075-T6 aluminum
Comprehensive top picatinny rail designed for optional accessory attachments on the handguard
The handguard is equipped with quick disconnect sling sockets located at the 3, 6 and 9 o'clock positions
Handguard with an internal diameter of 1.3 inches and an external diameter of 1-1/2 inches
Compatible with military specification (mil-spec) AR-15 upper receivers and barrels
Twist rate is 1:10
1/2-28 unified national fine (UNF) thread
The barrel is constructed from chrome moly vanadium steel and features a QPQ corrosion-resistant finish applied to both the interior and exterior surfaces

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.